[TowerTalk] 2-el 15/20 meter duobander

[Jeff]

Stan is a much better modeler than I am so in my case (4-ele 17m + 3-ele 30m 
on same boom, separate feeds) I would not say "sure, no problem."  However 
AutoEZ can do some tricks that make working on multi-band stuff easy.  For 
example in my case I have two separate feeds and AutoEZ can feed the 
antennas from different feed points depending on frequency which is how you 
can simultaneously optimize on two bands at once.  I really don't know how 
guys did it back in the day even with modeling software.

Check out the list of examples on the guy's page here.  Pretty often he will 
add some application note comment on topics kicked around on the various 
reflectors.  That's how the 4-sq model was implemented in that tool - he saw 
guys talking about the 4sq in several flavors and wrapped it into one big 
mother of a model which will sing an opera if you know enough about what you 
are doing to do the conducting.

http://ac6la.com/aecollectiontoc.html

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: Stan Stockton
Sent: Tuesday, November 28, 2017 8:56 PM
To: john at kk9a.com
Cc: towertalk at contesting.com
Subject: Re: [TowerTalk] 2-el 15/20 meter duobander

Sure.  No problem.

> On Nov 28, 2017, at 9:43 PM, <john at kk9a.com> <john at kk9a.com> wrote:
>
> Can it optimize for a specific impedance?  In other words can it design an
> OWA?
>
> John KK9A
>
> -----Original Message-----
> From: Stan Stockton [mailto:wa5rtg at gmail.com]
> Sent: Tuesday, November 28, 2017 9:36 PM
> To: john at kk9a.com
> Cc: towertalk at contesting.com
> Subject: Re: [TowerTalk] 2-el 15/20 meter duobander
>
> Anther reason to own AutoEZ.  It can design a duo bander for you in about
> ten minutes.
>
> Stan, K5GO
>
>> On Nov 28, 2017, at 7:18 AM, "john at kk9a.com" <john at kk9a.com> wrote:
>>
>> I played modeling 2el dual banders a long time ago and I recall having
>> success just putting the higher frequency Yagi in-between the elements
>> of the lower frequency Yagi. It is easy to model and see what happens.
>> Adding more elements and more bands really complicates things, kudos
>> to the designers of the excellent multiband interlaced beams.
>>
>> John KK9A
>>
>>
>> To:    towertalk at contesting.com
>> Subject:    [TowerTalk] 2-el 15/20 meter duobander
>> From:    Tom Osborne <w7why1 at gmail.com>
>> Date:    Mon, 27 Nov 2017 12:58:40 -0800
>> List-post:    <mailto:towertalk at contesting.com>
>> Hi all
>>
>> I have a HB 2-el 20 meter monobander on a 16 foot boom.  I would like
>> to add 15 meters to this antenna, but can't find any diagrams anywhere
>> for such an animal.  Googled it but no joy.
>>
>> Does anyone know of a good setup for 20 and 15 on the same boom
>> without interaction to each other??  Thanks and 73 Tom W7WHY
>> __________
>>
>> _______________________________________________
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>>
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